[Enhance] Add "statistics" meta table and fix some mysql compatibility problem#4991

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morningman merged 2 commits intoapache:masterfrom

FlowerSaid:songdev

Dec 3, 2020

Commits on Dec 1, 2020

1,Add metadata table ‘statistics’ to store index information;2,Modify the return type of method ‘str_to_date’ to the actual type datetime;3,In the header information returned by mysql, the data typ…

songchuanyuan
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songchuanyuan
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Commits on Dec 2, 2020

1,Delete the modification of a function;2,Delete modifier name.

songchuanyuan
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songchuanyuan
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